What to do if domain name taken by spam sites?

Well, let me use an example, we all likely know digg.com (know I’m not trying to advertise), but if I typo’d and typed diigg.com this domain is registered under one of those stupid advertising sites.

A domain name that I am interested in is taken by one of these random spam sites, does anyone know if these sites constantly renew their host or if there is a way to put a legit site at that address?

I know this doesn’t make a ton of sense, but I’m just a little peeved that the site name I wanted was taken by random text spam for “buying russian brides” etc…